Humble belief mine - bags are cleaner and help you keep the protein fresh. Just buy what you need and then put them into feeders. My experience is more dust with the use of bulk feed and augers. Resulting dust settles in the feeder ports and becomes more of a mess and especially when it does happen to rain. We work with five feeders. Three are lower profile Texas hunter 600 pound units which can be easily fed off the tailgate. Two others are larger 1,200 pounders which require driving directly next to the feeder and filling off the side rails of the bed or the truck box.
From time to time, others on our pasture have rented feed trailers for $50 and bought feed in bulk. The feed store is about 45 minutes away and you have to get that trailer back by the end of the day. You also have to set up a reservation in advance. Then you get to haul the trailer around the pasture, stuff the hose into the feeder, hold it here and notice all the dust involved with the auger mechanism. In addition, if you somehow end up with excess feed, you have to find a place to either store the remaining or dispose of it.
We have been feeding RHR (not Double Down) from Dilley the past several years. It is peanut based and let's just say the deer seem to appreciate it.
Considering it takes 4,200 pounds to top off our feeders when completely empty, if we can get down there often enough, it is best to just put a ton in the back of the P/U and avoid the trailer. Somewhat of a pain to unload a bunch of bags from a trailer on to a P/U and then unload them again to pour into feeders. If at all possible, we try to pick up bags as few times as possible. I have posted this photo several times, but it does give you an idea.